통계적 경향 분석을 통한 남한강 상류 수계 수질 변동 해석

초록

There are fifteen non-point pollution management areas in Korea and three of them (Doam lake, Daegi district and Golji-cheon) are located in theupstream of the Namhan river watershed. Many efforts to reduce non-point sources (NPS) pollution have been conducted, however, water qualitypollution in the watershed is still serious. To solve these problems, it is a priority to grasp water quality using statistical techniques. In this study, atrend analysis was conducted to evaluate the effect of NPS management in the watershed. The long-term trends from 1996 to 2018 of water qualityproperties were analyzed using data collected from the water environment information system. Seventeen monitoring stations were selected along themain stream in Namhan river basin. Monthly water quality properties (BOD, COD, TN, TP, TN/TP ratio, Conductivity, SS and Chlorophyll-a) werecollected and analyzed by Mann-Kendall test and LOWESS. The results showed that the Conductivity tended to increase in all regions and was thehighest level in Jijangcheon. Organic pollution such as BOD and COD tended to increase in the Jungseon area. SS did not show a large tendency,but it showed high concentration in the Doam watershed. In all regions, 40% of water quality properties showed a tendency to ‘UP’, 15% of waterquality properties tended to ‘DOWN’, and 46% indicated no tendency. In order to determine the cause of this, additional research and measures forimprovement are necessary. This study will be used for the establishment of water quality policy in the future.

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